沙县地处闽西北山区,水源充沛,青饲料资源丰富,池塘主养草鱼已成为当地淡水渔业主要养殖模式之一。草鱼是我国传统的优质养殖鱼类,具有肉质鲜嫩,生长速度快,适应范围广、营养价值高、养殖成本低等优点。但养殖草鱼疾病多、难治疗。如草鱼种阶段出血病、成鱼养殖阶段“三病”(烂 Shaxian County is located in the mountainous area of ​​northwestern Fujian, with abundant water resources and abundant green fodder resources. The main grass carp in ponds has become one of the major breeding modes for local freshwater fisheries. Grass carp is China’s traditional high-quality cultured fish, with fresh meat, fast growth, wide adaptation, high nutritional value, low cost of breeding. However, many diseases breeding grass carp, difficult to treat. Such as grass carp species bleeding stage, adult fish breeding stage “three diseases” (rotten